If the plant states are not variable for measurement, then it is possible to construct physical device state observer if :(a) Produces output at its plant states(b) Plants equations must satisfy the conditions of observability(c) Both a and b(d) Input must be presentThis question was addressed to me in semester exam.My question is from Optimal Control Systems topic in chapter Optimal Control Systems of Control Systems

If the plant states are not variable for measurement, then it is possi

1.	If the plant states are not variable for measurement, then it is possible to construct physical device state observer if :(a) Produces output at its plant states(b) Plants equations must satisfy the conditions of observability(c) Both a and b(d) Input must be presentThis question was addressed to me in semester exam.My question is from Optimal Control Systems topic in chapter Optimal Control Systems of Control Systems
Answer» Right answer is (c) Both a and b For EXPLANATION I would say: It produces at it OUTPUT the PLANT states, when driven by the both the plant input and output.

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